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An IRS official filed a complaint alleging that he was told that at least one Treasury Department official tried to interfere with an audit of President Trump's or Vice President Pence's tax returns, according to The Washington Post, citing people familiar with the complaint.

The whistleblower spoke to the Post and confirmed that he had filed the complaint to Congress's tax-writing committees and the Treasury Inspector General for Tax Administration.

“I steadfastly refuse to discuss the substance or details of the complaint, but I have some legitimate concerns about reckless statements being made about whistleblowers,” he told the Post.

The Democratic-led House Ways and Means Committee first mentioned in court documents in August that it had received credible allegations from a federal employee of potentially inappropriate attempts to influence the IRS's mandatory audit program for presidential and vice presidential tax returns.

The Post's story provides details that had not been in court documents, including that the complaint was made by a career IRS employee and that it alleges potential interference in the audit program by a political employee at the Treasury Department.